Advanced

Configuration Methods
You can pass a configuration options object when initializing Aspecto in code, like this for example:
require('@aspecto/opentelemetry')({
    serviceName: 'my-service',
    env: 'production',
    samplingRatio: 0.1
});
Or add configuration file named aspecto.json near your package.json with the same options as above:
{
    serviceName: 'my-service',
    env: 'production',
    samplingRatio: 0.1
}
Or use various environment variables, for example:
export OTEL_SERVICE_NAME=my-service
Values are evaluated in the following priority:
1.options object
2.environment variables
3.config file
4.default values
Configuration Options

Available install configurations (all are optional):
Option
Environment Variable
Type
Default
Description
disableAspecto
DISABLE_ASPECTO
boolean
false (aspecto enabled)
Disable aspecto
env
NODE_ENV
string
process.env.NODE_ENV
Set environment name manually
aspectoAuth
ASPECTO_AUTH
UUID
​
Set Aspecto token from code instead of using aspecto.json
serviceName
OTEL_SERVICE_NAME
string
"name" in package.json
Set serviceName manually instead of reading it from package.json. For example: a service that runs in multiple "modes"
serviceVersion
OTEL_SERVICE_VERSION
string
"version" in package.json
Set serviceVersion manually instead of reading it from package.json
samplingRatio
ASPECTO_SAMPLING_RATIO
number
1.0
How many of the traces starting in this service should be sampled. Set to number in range [0.0, 1.0] where 0.0 is no sampling, and 1.0 is sample all. Specific rules set via aspecto app takes precedence 
requireConfigForTraces
ASPECTO_REQUIRE_CONFIG_FOR_TRACES
boolean
false
When true, the SDK will not trace anything until remote sampling configuration arrives (few hundreds ms). Can be used to enforce sampling configuration is always applied, with the cost of losing traces generated during service startup.
logger
-
logger interface
​
Logger to be used in this tracing library. Common use for debugging logger: console
collectPayloads
ASPECTO_COLLECT_PAYLOADS
boolean
true
Should Aspecto SDK collect payloads of operations
otlpCollectorEndpoint
OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
string
https://otelcol-fast.aspecto.io/v1/trace
Target URL to which the OTLP http exporter is going to send spans
exportBatchSize
ASPECTO_EXPORT_BATCH_SIZE
number
100
How many spans to batch in a single export to the collector
exportBatchTimeoutMs
ASPECTO_EXPORT_BATCH_TIMEOUT_MS
number
1000 (1s)
Maximum time in ms for batching spans before sending to collector
writeSystemLogs
-
boolean
false
If true, emit all log messages from Opentelemetry SDK to supplied logger if present, or to console if missing
customZipkinEndpoint
-
URL
​
Send all traces to additional Zipkin server for debug
sqsExtractContextPropagationFromPayload
ASPECTO_SQS_EXTRACT_CONTEXT_PROPAGATION_FROM_PAYLOAD
boolean
true
For aws-sdk instrumentation. Should be true when the service receiveMessages from SQS which is subscribed to SNS and subscription configured with "Raw message delivery": Disabled. Setting to false is a bit more performant as it turns off JSON parse on message payload
extractB3Context
ASPECTO_EXTRACT_B3_CONTEXT
boolean
false
Set to true when the service receives requests from another instrumented component that propagate context via B3 protocol multi or single header. For example: Envoy Proxy, Ambassador and Istio
injectB3ContextSingleHeader
ASPECTO_INJECT_B3_CONTEXT_SINGLE_HEADER
boolean
false
Set to true when the service send traffic to another instrumented component that propagate context via B3 single header protocol
injectB3ContextMultiHeader
ASPECTO_INJECT_B3_CONTEXT_MULTI_HEADER
boolean
false
Set to true when the service send traffic to another instrumented component that propagate context via B3 multi header protocol. For example: Envoy Proxy, Istio
Advanced Settings
Exporting Format
Data collected by the SDK is sent to Aspecto's collector in protobuf format by default. 
An alternative is to send the data in JSON format, which uses less CPU for encoding the message but is more verbose - causing more data to be sent over the network. 
To export data over JSON instead of protobuf, set the environment variable  ASPECTO_TRACE_EXPORT_JSON to any value.
Disabling Aspecto
Set the environment variable DISABLE_ASPECTO to any value, to disable Aspecto.
Affect lambda and GCF wrappers as well.
Useful when running unit tests, or as a simple kill switch.

Customize Defaults

Send Spans Manually

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Configuration Methods

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Advanced Settings